It is the quarter-final and the two designers who have made it to this stage now must take on two rooms each. In this heat, our two designers both take on a living room and a sitting room but the stakes are high as Kelly and Daniel must decide who goes through to the semi-final stage. Their budgets have increased as they have £2,000 each for their two rooms, and their team has doubled - they have two builders and two decorators to manage. They have 48 hours across three days but in their toughest challenge yet, one room must be finished and judged on day two. In this episode, our designers are in Worsley near Salford, Manchester, trying to transform rooms in Mock Tudor imposing houses, but will their designs be inkeeping with the properties as well as impress the homeowners? One designer has problems with their waterworks and might not be able to deliver what they have promised, and a delivery mix up means grave lighting issues. For the other designer, a timing issue might hinder their whole design integrity. Both designers draw on their practical and creative resources when they are given some metal tins to enhance but can they rise to the challenge? Meanwhile, architectural historian Tom Dyckhoff discovers hidden tunnels beneath the waterways and looks at what life was like when these houses were originally built.